Liquid-cooled supercharged internal combustion engine

ABSTRACT

A liquid-cooled super-charged internal combustion engine in which the line for the compressed combustion air and the line for the cooling liquid are connected, prior to entry into the engine, to an elbow-housing that has two channels with a common separating wall for the heat-exchange between cooling liquid and air.

United States Patent Herbert Deutschmann Inventors Stuttgart-Bad Cannstatt; Ulrich Conrad, Ludwigsburg-Ossweil, 1 Germany Appl. No. 713,177 Filed Mar. 14, 1968 Patented May 1 1, 1971 l Assignee DIiIHIQI'BQIIZ Aktiengesellscha Stuttgart-Unterturkheim, Germany Priority Mar. 17, 1967 Germany 0525581 LIQUID-COOLED SUPEReCI'IARGED INTERNAL COMBU TION ENGINE 1s CIaims,2I)rawingFigs.

u.s.c1 123/52, l23/4l.76, 123/41.17, 123/41.s2, 123/119, 123/122, 285/302, 285/270. 1111.01 ..F02b 29/04, 4 FOIp I/06,FI,6I 27/12 Field oiSearch 123/41.s2,

41.76, 41.77, 52 (MU), 52 (MC), 52 (M), I14 (CA); 285/302, 370

References Cited UNITED STATES PATENTS 2,963,007 12/1960 beach l23/4l.82

3,027,706 4/ I 9.62 Sprick I 23/1 I9C4 RE22,7 l 3 H1946 Howe 285/302 1,862,723 6/1932 Summers.. l23/52MV 2,I52,594 3/ I 939 Klotsch I23/52MV 2,716,399 8/ I 955 RothweII I23/52MV 3,290,063 12/1966 Haeber 285/302 I,l64,675 I2/l9I5 Sturteuantu n l23/4L82 3,353,522 11/1967 Ley I23/4L82 Primary Examiner-Mark M. Newman Attamey -Craig, Antonelli, Stewart & I'Iill ABSTRACT: A liquid-cooled super-charged internal combustion engine in which the line for the compressed combustion air and the line for the cooling liquid are connected, prior to entry into the engine, to an elbow-housing that has two channels with a common separating wall for the heatexchange between cooling liquid and air.

ljlllllll'llllllp. -$55565 PATENTEU HAN 1 1971 3577.961

ATTORNEYS LIQUID-COOLED SUPER-CHARGED INTERNAL COMBUSTION ENGINE The present invention relates to a liquid-cooled supercharged intemal combustion engine. The aim underlying the present invention essentially consists in simplifying an internal combustion engine of this type from a structural point of view and to constitute the same more compact. For this purpose, according to the present invention provision is made that the line for the super-charged combustion air and the line for the cooling liquid are connected, prior to entry into the engine, to an elbow housing which is provided with two channels having a common separating wall for the heat-exchange.

A guide wall is dispensed with by the combination of the two lines in the elbow housing. Both the structural space and the weight of the engine as well as the price thereof are advantageously reduced thereby.

Additionally, the cooling of the charging air is improved and such a cooling can be achieved even in the absence of a charging air cooler, properly speaking.

Since also the intermediate space between two structurally separate lines, which has to be present nonnally by reason of the casting shrinkage and the necessary tolerances, is obviated by the present invention, a particularly compact type of construction of the internal combustion engine results. This advantage is particularly important for V-type engines in which relatively little space is available for the lines in the V-space.

The aforementioned intermediate space forms a dirt-collecting comer which is accessible only with difficulty for painting and subsequent cleaning- This disadvantage is also avoided by the present invention.

The elbow housing for the two channels may be formed, for example, by a pipe with inserted separating wall.

However, two half, dish-shaped housing parts may be the cooling water, the charging air is preheated by the present invention for starting at lower external temperatures. The starting operation is thereby facilitated.

ln order to be able to match the sealing between elbow'and engine housing to the different requirements for liquid and air,

according to a further feature of the present invention, a tubu larly shaped intermediate piece is provided that is inserted in a fluidtight manner both at the engine in the inlet aperture of the cooling liquid channel for a cylinder as also'into a connecting aperture of thecooling liquid channel in the elbow housing. The sealing for the air channel between the elbow and en'- gine housing can thus be realized' separately, for example, softly with respect to the liquid seal. The arrangement accord ing to the present invention is advantageous also for such types of internal combustion engines which include several cylinder heads arranged in rows, for example, per cylinder one head. The various tolerances of several cylinder heads can be compensated for with respect to a common elbow housing by the softly constructed sealing means for the charging air.

Particularly with internal combustion engines having several cylinder heads, it is desirable that an individual cylinder head can be disassembled without having to remove theientire line system for the cooling liquid, charging air and exhaust gases.

ln order to fulfill this requirement also with an internal combustion engine having an elbow housing according to the present invention, it is further proposed that the intermediate.

piece is arranged lowerable into the engine housing. For this purpose, the intermediate piece may be provided with an outwardly projecting abutment part that is externally accessible through'an aperture of the engine housing.

Before the cylinder head is disassembled, the intermediate piece can be brought externally into its recessed position. It is also avoided thereby that the cooling liquid or individual drops thereof can reach the sealing places for the charging air channel and from there possibly into the cylinder.

The intermediate piece can be stopped in its operating position by a detachable abutment part. This can engage in a simple manner at the outwardly extending abutment part of the intermediate piece.

The detachable abutment part can be made in one piece with a detachable cover or with a detachable hood at the engine housing. The detachable abutment part may be arranged, for example, at a control housing coveri The construction of this cover, together with the abutment is simplified if the abut ment part of the intermediate piece extends through the associated aperture of the engine housing.

The intermediate piece may be constructed in one piece with-its abutment part if the cross section of the associated aperture in the engine housing forms an open U.

Accordingly, it is an object of the present invention to provide a liquid-cooled super-charged internal combustion engine which avoids by simple means the aforementioned shortcomings and drawbacks encountered in the prior art.

Another object of the present invention resides in a liquidcooled super-charged internal combustion engine which is structurally simplified and provides greater compactness.

A further object of the present invention resides in a liquidcooled super-charged internal combustion engine in'which a separate partition or guide wall between the two lines for the cooling liquid and charging air may be dispensed with.

A still further object of the present invention resides in a liquid-cooled super-charged internal combustion engine in which the cooling of the charging air is improved even'in the absence of a charging air cooler.

Still another object of the present invention resides in a liquid-cooled super-charged internal combustion engine in which a particularly favorable space utilizationis created with V-type engines, avoiding dirt-collecting corners, which are difiicult to reach;

A still further object of the present invention resides in a liquid-cooled super-charged internal combustion engineof the aforementioned type in'which cross-sectional reductions of the channels are avoided as much as possible, the charging air can be preheated; and the seals between the elbow and engine housing can be matched to the different requirements forthe liquid andair media.

These and further objects, features, and advantages of the presentinvention will become more obvious from the following description when taken in connection with the accompanying drawing which shows, for purposesof illustration; one embodiment in accordance with the present invention; and wherein:

H0. 1 is a partial cross-sectional viewthrough the left cylinder row of'a V-type internal combustion engine according to the present invention, and

FIG. 2 is a partial cross-sectional'view'through the right cylinder row of the engine illustrated in FIG. 1.

Referring'now to the drawing wherein like reference numerals are used'throughout the two views"todesign'ate like parts, reference numeral 10 designates therein a part of the crankcase of the left cylinder row generally designated by reference numeral 11. An individual cylinder head generally designated by reference numeral 12 for the working cylinder 13 is mounted on the crankcase part 10.

The inlet channel 16 for "the charging air and the inlet channel 17 for the cooling liquid terminate at the separating surface l4'ofthe cylinder head 12 leading to" an elbow"ho'using generally designated 'by reference numeral 15 and located within the area of the V of the engine. v

The orifice of the cooling liquid channel 17 is formed by a cylinder 18 into which a tubularly shaped intermediate piece 19 is displaceably inserted. The intermediate piece I9 is sealed with respect to this cylinder 18 ina fluidtight' manner by an annular seal 20.

A control housing 21 is mounted over the cylinder head 12 which is accessible by way of a cover 22.

The elbow housing 15 is subdivided by a separating wall 23 into a cooling liquid channel 24 and into a charging air channel 25. The charging air is cooled during normal operation by the separating wall 23. During the starting of the internal combustion engine with a heating installation for the preheating of the cooling liquid, however, the charging air is heated for facilitating the starting operation.

The manner of securing the elbow housing at the cylinder head can be seen from FIG. 2 in connection with the right cylinder row, which corresponds as to the securing to the left row. Parts corresponding to FIG. 1 are designated in H0. 2 with the same reference numerals but using the suffix a. The separating wall 230 of the elbow housing 15a is provided with passage bores 26a for the passage of the securing bolts 27a. The cross section of the channels 24a and 25a is not reduced by this bolt arrangement.

As can be seen from FIG. 1, the tubular-shaped intermediate connecting piece 19 is displaceably inserted into a connecting aperture 28 in the elbow housing 15. The aperture 28 is in communication with the liquid channel 24. The intermediate piece 19 is sealed in a fluidtight manner with respect to the elbow housing 15 by a further annular seal 29.

The intermediate connecting piece 19 is provided with an outwardly extending abutment part 30 which extends outwardly through an aperture 31 of the cylinder head. The abutment part 30 is displaceable in the aperture 31. The aperture 31 terminates in the longitudinal direction of the intermediate connecting piece 19 in the separating surface 14.

The portion of the abutment 30 at the intermediate piece 19 which projects out of the cylinder head l2, abuts in the illustrated operating position against a fixed abutment part 32 of the control housing 21.

After the disassembly of the control housing 2!, the intermediate piece 19 can be inserted or recessed limited by the abutment part 30 to such an extent into the cylinder head l2 or into the cylindrical part 18 thereof that its end face 33 adjacent the elbow housing 15 lies in the same plane as the separating surface 14 or is recessed with respect thereto. Thereafter, the cylinder head 12 can be disassembled in the direction of the cylinder axis.

While we have shown and described only one embodiment in accordance with the present invention, it is understood that the same is not limited thereto but is susceptible of numerous changes and modifications as known to a person skilled in the art, and we therefore do not wish to be limited to the details shown and described herein but intend to cover all such changes and modifications as are encompassed by the scope of the appended claims.

We claim:

1. A liquid cooled super-charged internal combustion engine including a cylinder block and a cylinder head, in which super-charged combustion air is supplied to a cylinder, comprising line means for the super-charged combustion air and line means for the cooling liquid, both of said line means being connected prior to the entry into the engine to an integral unitary elbow-housing means which is separate from the cylinder block and cylinder head and forms two channels with common separating wall means therebetween for the direct heatexchange between liquid and super-charged air thereby to cool the super-charged combustion air by said liquid.

2. An internal combustion engine according to claim 1, wherein the separating wall means accommodates the passages for securing means.

3. An internal combustion engine according to claim 1, wherein the separating wall means includes at least in the air channel a surface enlarged by rib means.

4.An internal combustion engine according to claim 1, further comprising tubularly shaped intermediate connecting means inserted at the engine in a liquidtight manner into an inlet aperture of the cooling liquid channel for a respective cylinder as well as also into a connecting aperture of the coolingli uid channel in the elbow-housing means.

n internal combustion engine according to claim 4,

wherein said intermediate connecting means is lowerable into the engine housing.

6. An internal combustion engine according to claim 4, wherein the outwardly extending abutment means of the intermediate connecting means extends through an associated aperture of the engine housing.

7. An internal combustion engine according to claim 6, wherein the aperture of the engine housing for the access to the intermediate connecting means forms in cross section an open U.

8. An internal combustion engine according to claim 4, wherein said intermediate connecting means includes outwardly extending abutment means which is accessible through an aperture of the engine housing.

9. An internal combustion engine according to claim 8, wherein said intermediate connecting means abuts in the operating position against a detachable abutment part.

10. An internal combustion engine according to claim 9, wherein said intermediate connecting means is lowerable into the engine housing.

H. An internal combustion engine according to claim 9, wherein said detachable abutment part engages at the outwardly extending abutment means.

12. An internal combustion engine according to claim 11, wherein the detachable abutment part is formed in one piece with a detachable cover part at the engine housing.

13. An internal combustion engine according to claim 12, wherein said detachable cover part is a detachable hood for a control housing.

14. An internal combustion engine according to claim 12, wherein the outwardly extending abutment means of the intermediate connecting means extends through an associated aperture of the engine housing.

15. An internal combustion engine according to claim 14, wherein the aperture of the engine housing for the access to the intermediate connecting means forms in cross section an open U. 

1. A liquid-cooled super-charged internal combustion engine including a cylinder block and a cylinder head, in which supercharged combustion air is supplied to a cylinder, comprising line means for the super-charged combustion air and line means for the cooling liquid, both of said line means being connected prior to the entry into the engine to an integral unitary elbow-housing means which is separate from the cylinder block and cylinder head and forms two channels with common separating wall means therebetween for the direct heat-exchange between liquid and super-charged air thereby to cool the super-charged combustion air by said liquid.
 2. An internal combustion engine according to claim 1, wherein the separating wall means accommodates the passages for securing means.
 3. An internal combustion engine according to claim 1, wherein the separating wall means includes at least in the air channel a surface enlarged by rib means.
 4. An internal combustion engine according to claim 1, further comprising tubularly shaped intermediate connecting means inserted at the engine in a liquidtight manner into an inlet aperture of the cooling liquid channel for a respective cylinder as well as also into a connecting aperture of the cooling liquid channel in the elbow-housing means.
 5. An internal combustion engine according to claim 4, wherein said intermediate connecting means is lowerable into the engine housing.
 6. An internal combustion engine according to claim 4, wherein the outwardly extending abutment means of the intermediate connecting means extends through an associated aperture of the engine housing.
 7. An internal combustion engine according to claim 6, wherein the aperture of the engine housing for the access to the intermediate connecting means forms in cross section an open U.
 8. An internal combustion engine according to claim 4, wherein said intermediate connecting means includes outwardly extending abutment means which is accessible through an aperture of the engine housing.
 9. An internal combustion engine according to claim 8, wherein said intermediate connecting means abuts in the operating position against a detachable abutment part.
 10. An internal combustion engine according to claim 9, wherein said intermediate connecting means is lowerable into the engine housing.
 11. An internal combustion engine according to claim 9, wherein said detachable abutment part engages at the outwardly extending abutment means.
 12. An internal combustion engine according to claim 11, wherein the detachable abutment part is formed in one piece with a detachable cover part at the engine housing.
 13. An internal combustion engine according to claim 12, wherein said detachable cover part is a detachable hood for a control housing.
 14. An internal combustion engine according to claim 12, wherein the outwardly extending abutment means of the intermediate connecting means extends through an associated aperture of the engine housing.
 15. An internal combustion engine according to claim 14, wherein the aperture of the engine housing for the access to the intermediate connecting means forms in cross section an open U. 